Twisty Tracks! Remember Candy Train, anyone?
They've taken Candy Train (an old game by Popcap) and made ist a WHOLE lot better and harder. This definitely satisfy my craving for another pipe dream type game, and it's a pretty one too.
If you've played Candy Train before, think jewels instead of cars, coins instead of candy, and multiple maps per puzzle connected by bridges! They've taken Candy Train up a whole new level with that bridge and multiple maps concept. It's also made Twisty Tracks so much harder. (which makes for more replay value.)